QTR-Quadtone RIP

Tom,

I wonder if you might consider uploading that Excel file to the Files 
section here instead?

I do not have a densitometer so I have to use my Epson 3200 scanner 
for my first attempts at curve creation I now have underway with the 
UT7 inkset. Being able to convert luminosities to densities would be 
very handy and although I could just use the formula from John's post 
I would bet I am not the only one in the 'no densitometer' boat.

Also Tom, while I have you on line so to speak :~) I wonder if you 
can clarify something from your user guide. In the Ink Density 
Calibration section on page 15 you say:

"For Ultrachrome inks, the measurements above are all that is 
required. For QuadTone inks, this process is repeated for each 
lighter ink, comparing it to the next darker ink, calculating its 
density relative to that ink and then converting it to a density 
relative to black."

I believe that what you mean to say is simply that the process is 
repeated for each lighter ink, calculating its density relative to 
black. Is that not correct? All that one needs later in the curve 
generation is the percentage of the black ink stepwedge that 
corresponds (in density terms) to 100% of the other gray inks, 
correct? If so, it seems to me you do not need to in any way compare 
the other grays with each other, but only with the black stepwedge 
densities directly. Thanks to confirm if I've understood things 
correctly here.

Best wishes,

Dave Meddings


--- In QuadtoneRIP@yahoogroups.com, "Tom Moore" <r.t.moore@r...> 
wrote:
 
> I updated my spreadsheet to include LAB density curves down for 
dmax down to
> 1.35. If you want a copy rather than making your own, email me and 
I'll send
> it back.
> 
> Tom